KR20140044394A - Allocating backhaul resources - Google Patents

Abstract

The system, apparatus, and method may relate to operating a wireless communication resource for a wireless communication system including a relay node and a base station. The backhaul link data rate for the first wireless link between the relay node and the base station can be identified. The access link data rate for the second wireless link between the relay node and the user equipment (UE) can be identified. The allocation of available resources between the backhaul link and the access link may be adjusted or changed to optimize the allocation of resources.

Description

Allocating backhaul resources {ALLOCATING BACKHAUL RESOURCES}

Priority claim

This application is incorporated by reference in U.S. Provisional Patent Application No. 61 / 514,721, filed August 3, 2011, and U.S. Patent Application No. 13 / 486,541, filed June 1, 2012, the entire contents of which are incorporated herein by reference. Included-Claims priority based on

TECHNICAL FIELD The present disclosure relates to wireless communication systems, and more particularly, to allocation of backhaul resources.

As communications technology evolved, more advanced network access equipment was introduced that could provide services that were not previously possible. The network access equipment may include systems and devices that are improvements in corresponding equipment within conventional wireless communication systems. These advanced or next-generation equipment can be included in evolving wireless communications standards such as Long-Term Evolution (LTE) and LTE-Advanced (LTE-A). For example, an LTE or LTE-A system may be an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and may include an evolved Node B (eNB), a radio access point, or similar components rather than a conventional base station. . As used herein, the term "access node" refers to a conventional base station that creates a geographic area of receive and transmit coverage that allows a UE or relay node to access other components in a communication system, A wireless access point, or any component of a wireless network, such as LTE or LTE-A Node B or eNB. In this document, the terms "access node" and "access device" may be used interchangeably, but it will be appreciated that an access node may include a plurality of hardware and software. A relay node (RN) is a device that facilitates communication with an eNB. The RN can generally be divided into three groups-a layer 1 RN, a layer 2 RN, and a layer 3 RN. Relay technology may improve user throughput and network coverage.

The system, apparatus, and method may relate to operating a wireless communication resource for a wireless communication system including a relay node and a base station. The backhaul link data rate for the first wireless link between the relay node and the base station can be identified. The access link data rate for the second wireless link between the relay node and the user equipment (UE) can be identified. The allocation of available resources between the backhaul link and the access link may be adjusted or changed to optimize the allocation of resources.

1 is a schematic diagram of an exemplary wireless communication system including a donor eNB and a relay node.
FIG. 2 shows a subframe for half-duplex communication over a backhaul link. FIG.
3 illustrates an example of backhaul subframe allocation.
4A is a process flow diagram for static allocation of backhaul resources.
4B is a swim-lane diagram for static allocation of backhaul resources.
5 is a schematic block diagram of example resource allocation for an access link and a backhaul link.
6A is a process flow diagram for dynamic allocation of backhaul resources.
6B is a swim lane diagram for dynamic resource allocation for a backhaul link.
7 is a block diagram of an exemplary asynchronous multicast broadcast single frequency network (MBSFN) resource allocation for multiple relay nodes.
8 is a block diagram of an exemplary asynchronous multicast broadcast single frequency network resource allocation for multiple relay nodes sharing the same subframe.
9A is a process flow diagram for quasi-static backhaul resource allocation.
9B illustrates a swim lane diagram 950 for quasi-static backhaul resource allocation.

Aspects of the present disclosure relate to backhaul resource allocation for communication between an eNB and a relay node (RN). For static subframe allocation, the RN may signal the number of connected users in the RN cell to the donor eNB (DeNB). The E-UTRAN supports relaying by relaying a relay node (RN) wirelessly to an eNB (called a DoNB) serving an RN to communicate with an evolved packet core (EPC) network. All RNs in the same donor cell may have the same backhaul subframe configuration.

In the case of dynamic resource allocation, the RN may signal the transmission data rate on each of its access links to the DeNB for optimal resource allocation. The transmission data rate may be an average data rate over a short time window.

For quasi-static assignment, the RN may signal / update the DeNB with an average signal to interference plus noise ratio (SINR) of each UE (or RN cell UE) connected to the RN. The geometry or average SINR of each RN cell UE may be reported to the DeNB at call setup and will be updated quasi-statically in accordance with UE mobility and radio link changes. Multiple RNs may form the RN group sharing the same subframe resource and identified by the RN group ID. Different RN groups may use different subframe resources to avoid interference.

First, although an exemplary implementation of one or more embodiments of the present disclosure is provided below, it is contemplated that the disclosed system and / or method may be implemented using any number of techniques, whether presently known or existing You will know that you can. The present disclosure should not be construed as limited to the exemplary implementations, drawings, and techniques described below, including the exemplary designs and implementations illustrated and described herein, and the full scope of equivalents thereof, And can be modified within a range of ranges.

As used herein, the terms "device", "user equipment" and "UE" refer, in some cases, to mobile phones, personal digital assistants, handheld or laptop computers, BLACKBERRY® devices, and communication functions. A mobile device such as a similar device having Such a UE may include a UE and its associated removable memory module (Subscriber Identity Module (SIM) application, Universal Subscriber Identity Module (USIM) application, or Removable User Identity Module (R-UlM) application). It is not limited to these). As another alternative, such a UE may consist of the device itself without such a module. In other cases, the term "UE " may refer to a device that has a similar function but is not mobile (such as a desktop computer, set-top box, or network device). The term "UE " may also refer to any hardware or software component that can terminate a communication session for a user. Also, the terms "user agent", "UA", "user equipment", "UE", "user device" and "user node" may be used synonymously herein. Other abbreviations and terms are provided below:

CQI Channel Quality Indicator

DL Down Link

E-UTRAN Evolved Universal Terrestrial Radio Access Network

eNB E-UTRAN Node B

DeNB Donor Enb

HARQ Hybrid ARQ (Automatic Repeat Request)

LTE Long Term Evolution

LTE-A LTE-Advanced

MBSFN Multicast Broadcast Single Frequency Network

MCS Modulation and Coding Scheme

MME Mobility Management Entity

PRB Physical Resource Block

QoS Quality of Service

RN Relay Node

RRC Radio Resource Control

SGW Serving Gateway

TTI Transmission Time Interval

UE User Equipment

UL Uplink

A type I relay node (RN) is an in-band / out-band relay node that can have the following characteristics:

이는 셀들을 제어하고, 이들 셀 각각은 UE에게 도너 셀과 상이한 별개의 셀로서 보인다.

This controls the cells, each of which appears to the UE as a separate cell that is different from the donor cell.

이 셀들은 그 자신의 물리 셀 ID, 동기화 채널, 기준 심볼 등을 가질 것이다.

These cells will have their own physical cell ID, synchronization channel, reference symbol, and so forth.

단일 셀 동작과 관련하여, UE는 중계 노드로부터 직접 스케줄링 정보 및 HARQ 피드백을 수신하고 그의 제어 채널(SR/CQI/ACK)을 중계 노드로 송신할 것이다.

In connection with single cell operation, the UE will receive scheduling information and HARQ feedback directly from the relay node and transmit its control channel (SR / CQI / ACK) to the relay node.

Type I relays feature wireless in-band backhaul. The layer 1 RN may be a repeater that merely retransmits the received signal without any modification other than amplification and possibly some delay. The layer 2 RN may demodulate / decode the transmission it receives, re-encode / modulate the result of the decoding, and then transmit the modulated data. The layer 3 RN may have full radio resource control functionality and thus function similar to an access node. The radio resource control protocol used by the RN may be the same as that used by the access node, and the RN may typically have a unique cell identity used by the access node. The "layer x" RN is distinguished from the "type x" RN. For example, the layer 1 RN is not a type 1 RN; In fact, Type 1 RNs are similar in functionality to Layer 3 RNs. Type 1 RNs are described in more detail below.

For purposes of this disclosure, an RN is distinguished from an eNB or other access node because the term RN is used to access at least one eNB or other access node (eg, to access other components within a communication system such as MME / SGW). And the cell associated with the access node) and possibly other RNs. In addition, for the purposes of this disclosure, the term "eNB" is not limited to "evolved node-B", but communicates with components of an MME / SGW or enhanced packet core (EPC). May refer to any type of access node suitable for use.

Certain aspects of the present disclosure relate to a method of operating a wireless communication system comprising a relay node and a base station. The method may include, at the base station, identifying a backhaul link data rate for the first wireless link between the relay node and the base station. An access link data rate can be identified for the second wireless link between the relay node and the user equipment (UE). The allocation of available resources between the backhaul link and the access link can be adjusted and optimized.

Certain aspects of the present disclosure relate to network elements operating in a wireless communication network. The network element may include a hardware processor and a transceiver. The hardware processor and the transceiver are configured to identify the backhaul link data rate for the first wireless link between the relay node and the base station. The access link data rate for the second wireless link between the relay node and the user equipment (UE) can be identified. The allocation of available resources between the backhaul link and the access link can be adjusted and optimized.

In certain implementations of embodiments, the backhaul data rate between the base station and the particular relay node can be identified based at least in part on the average signal to interference plus noise ratio (SINR) measured over a particular link.

In certain implementations of embodiments, the access link data rate may be identified based at least in part on the average signal to interference plus noise ratio (SINR) observed over the access link.

In certain implementations of the embodiments, the average SINR observed over the access link can be scaled by the power control parameter.

In certain implementations of embodiments, the access link data rate may be identified based at least in part on an average signal to interference plus noise ratio (SINR) observed over the access link between the relay node and the associated user equipment.

In certain implementations of the embodiments, the average SINR observed over the access link between the relay node and the UE may be scaled by the power control parameter.

In certain implementations of the embodiments, the allocation of resources between the backhaul link and the access link is based on the total data transmitted in n subframes over the backhaul link and over N independent access links (T _bh −n It is optimized by allocating n subframes every T _bh subframes so that the total data transmitted in) subframes is equal.

In certain implementations of the embodiments, the allocation of resources between the backhaul link and the access link is such that the expected future transport block for UE-j can be transmitted using n _ij resource blocks. Can be optimized by allocating n _ij resource blocks to convey data for UE-j over the backhaul link between -i.

In certain implementations of the embodiments, the expected future transport block size may be the minimum of the transport block size expected to be transmitted by RN-i and the size of the data buffer for UE-j, where UE-j Is connected to RN-i.

In certain implementations of embodiments, the allocation of resources between the backhaul link and the access link is performed via an access link associated with RN-i and total data transmitted in n _i subframes over the backhaul link ( T _bh -n _i ) may be optimized by allocating n _i subframes in the backhaul link between the base station and RN-i so that the total data transmitted in the T _bh subframes is the same.

In certain implementations of embodiments, optimizing the data rate over the backhaul link and the access link data rate associated with the relay node is based at least in part on the number of UEs connected to the relay node. And balancing the access link data rate.

Certain implementations may include receiving an average SINR of a UE access link from a relay node.

Certain implementations may include predicting a need for resources at the UE.

Certain implementations may include identifying signal to interference plus noise ratio between the relay node and the base station, and identifying the backhaul data rate to signal to interference and noise ratio. Is based at least in part on.

In certain implementations of embodiments, the access link data rate may be identified based at least in part on the average SINR of all UEs connected to the relay node.

In certain implementations of the embodiments, the backhaul data rate between the base station and the particular relay node is identified based at least in part on the average signal to interference plus noise ratio (SINR) measured over the particular link.

In certain implementations of embodiments, the access link data rate is identified based at least in part on the average signal to interference plus noise ratio (SINR) observed over the access link.

In certain implementations of the embodiments, the average SINR observed over the access link is scaled by the power control parameter.

In certain implementations of embodiments, the access link data rate is identified based at least in part on an average signal to interference plus noise ratio (SINR) observed over the access link between the relay node and the associated user equipment.

In certain implementations of the embodiments, the average SINR observed over the access link between the relay node and the UE is scaled by the power control parameter.

In certain implementations of the embodiments, the allocation of resources between the backhaul link and the access link is based on the total data transmitted in n subframes over the backhaul link and over N independent access links (T _bh −n It is optimized by allocating n subframes every T _bh subframes so that the total data transmitted in) subframes is equal.

In certain implementations of the embodiments, the allocation of resources between the backhaul link and the access link is such that the expected future transport block for UE-j can be transmitted using n _ij resource blocks. Optimized by allocating n _ij resource blocks to convey data for UE-j over the backhaul link between -i.

In certain implementations of the embodiments, the expected future transport block size may be the minimum of the transport block size expected to be transmitted by RN-i and the size of the data buffer for UE-j, where UE-j Is connected to RN-i.

In certain implementations of embodiments, the allocation of resources between the backhaul link and the access link is performed via an access link associated with RN-i and total data transmitted in n _i subframes over the backhaul link ( T _bh - the total data to be sent in the n _i) of sub-frames are to be equal, it is optimized by assigning every T _bh of n _i sub-frames for each sub-frame to the backhaul link between the base station and the RN-i.

In certain implementations of embodiments, optimizing the backhaul data rate and the access link data rate maintains a balance between the backhaul data rate and the access link data rate based at least in part on the number of UEs connected to the relay node. It includes.

Certain implementations of the embodiments can include receiving information about the UE from the relay node.

Certain implementations of the embodiments may include predicting a need for resources at the UE.

Certain implementations of the embodiments may include identifying signal-to-interference and noise ratio between the relay node and the base station, and identifying the backhaul data rate is based at least in part on the signal-to-interference and noise ratio.

In certain implementations of the embodiments, the backhaul data rate is identified based at least in part on the average signal to interference plus noise ratio (SINR) of all UEs connected to the relay node.

In certain implementations of the embodiments, the backhaul data rate is identified based at least in part on the total access link data rate of the relay node.

2 illustrates an example of a supported feature management object according to one embodiment of the disclosure. The wireless communication system 100 may represent the architecture of an LTE or LTE-A system, such as a UE in communication with an EUTRAN. In an example of the operation of an RN, the UE 102 communicates with the MME / SGW 112 via the RN 104 and a Donor eNB (DeNB) 106. The UE 102 can also communicate with the RN 104, the RN 104 can communicate with the eNB 108, and the eNB 108 in turn is represented by an phantom line. It communicates with the MME / SGW 110 via an interface such as.

The E-UTRAN is an eNB (Denor eNB) which serves the RN 104 to the RN 104 via a modified version of the E-UTRAN air interface, the modified version being referred to as the "Un" interface 118. 106) to support relaying by wireless connection. The RN 104 supports the DeNB function, which means that the RN 104 receives the E-UTRA air interface and the radio protocol of the S1 interface 114 and the X2 interface 116. The functions defined for the eNB also apply to the RN, unless explicitly stated. In addition to the eNB functionality, the RN 104 may also support some of the UE functionality (eg, physical layer, layer-2, RRC, and NAS functionality) for wirelessly connecting to the DeNB 106. In general, an eNB can host the following functions:

무선 자원 관리를 위한 기능들: 무선 베어러 제어, 무선 허가 제어, 연결 이동성 제어, 상향링크 및 하향링크 (스케줄링) 둘 다에서의 UE에의 자원의 동적 할당;

Functions for radio resource management: dynamic allocation of resources to the UE in both radio bearer control, radio admission control, connection mobility control, uplink and downlink (scheduling);

IP 헤더 압축 및 사용자 데이터 스트림의 암호화;

IP header compression and encryption of user data streams;

UE에 의해 제공되는 정보로부터 MME로의 어떤 라우팅도 결정될 수 없을 때 UE 접속 시의 MME의 선택;

Selection of the MME upon UE connection when no routing from the information provided by the UE to the MME can be determined;

서비스 제공 게이트웨이 쪽으로의 사용자 평면 데이터의 라우팅;

Routing of user plane data towards the serving gateway;

(MME로부터 발신된) 페이징 메시지의 스케줄링 및 전송;

Scheduling and sending of paging messages (from MME);

(MME 또는 O&M으로부터 발신된) 브로드캐스트 정보의 스케줄링 및 전송;

Scheduling and transmission of broadcast information (from MME or O &M);

이동성 및 스케줄링에 대한 측정 및 측정 보고 구성;

Configuring measurement and measurement reporting for mobility and scheduling;

(MME로부터 발신된) PWS(ETWS 및 CMAS를 포함함) 메시지의 스케줄링 및 전송;

Scheduling and transmission of PWS (including ETWS and CMAS) messages (from MME);

CSG 처리(CSG handling);

CSG handling;

상향링크에서의 전송 레벨 패킷 마킹.

Transport level packet marking on uplink.

The DeNB can host the following functions in addition to the eNB functions:

RN을 지원하기 위한 S1/X2 프록시 기능;

S1 / X2 proxy function to support RN;

RN을 지원하기 위한 S11 착신 및 S-GW/P-GW 기능.

S11 Incoming and S-GW / P-GW features to support RN.

An architecture for supporting the RN is shown in FIG. 1. The RN calls the S1 interface 114, the X2 interface 116, and the Un interface 118. DeNB 106 provides S1 and X2 proxy functionality between RN 104 and other network nodes (other eNBs, MMEs, and S-GWs). The S1 and X2 proxy functions include passing UE-only S1 and X2 signaling messages as well as GTP data packets between the S1 and X2 interfaces associated with the RN and the S1 and X2 interfaces associated with other network nodes. Due to the proxy function, DeNB 106 looks to the RN as MME (for S1-MME), eNB (for X2) and S-GW (for S1-U).

The above examples describe an eNB serving one RN, but each eNB can communicate with more RNs. Other configurations of the indicated components are possible, and there may be more, fewer, different, or additional components.

Relay techniques are used to improve average cell throughput and improve cell coverage. In addition, including the RN in the LTE-A system is also to effectively extend the UE's battery life, increase the UE throughput, and expand cell coverage. One of the problems posed by including the RN is that calculating the overall signal quality between the UE and the MME / SGW is complicated by the presence of two or more communication links. For example, although the connection between the MME and the eNB is often a good quality wired link, the link between the UE and the RN and the RN when determining which access node or RN the UE should connect to or try to camp on during the mobility procedure. Signal quality of both links between eNBs may be considered. Mobility procedures include cell selection cell reselection, handover, or, more generally, any mobility procedure that the UE may perform. In the embodiments described herein, the link between the UE and the RN may be referred to as an access link, and the link between the RN and eNB may be referred to as a backhaul link. However, other names can be used. In addition, for more complex communication systems, there may be multiple backhaul links if there is an additional RN between the eNB and the RN accessed by the UE. In addition, multiple access links may also exist. Other configurations are also possible, all of which are within the spirit and scope of the present disclosure.

The RN can operate in half-duplex mode to avoid in-band interference and reduce the RN cost. In conventional cellular networks, the backhaul link from eNB to MME / SGW is typically a wired or fiber optic connection. Wireless in-band backhaul for Type I relays enables fast roll-out of RNs in the network at lower cost. On the other hand, available radio resources must be distributed between the backhaul link and the access link (ie, the radio link between the UE and the RN). Part of the radio resource must be taken from the access link for backhaul link transmission.

FIG. 2 is a diagram illustrating DL subframe partitioning for an access link and a backhaul link. FIG. 2 illustrates a typical half-duplex communication between a DoNB and a RN. As a result, system capacity for Type I relay networks may depend on backhaul link quality as well as resource partitioning between the backhaul link and the access link. In a Type I relay network with in-band backhaul, the RN operates in half-duplex mode, meaning that the RN stops transmitting to the UE when receiving the DL transmission from the donor eNB. The total available radio resources are divided into two parts: backhaul link radio resources and access link radio resources.

DL resource partitioning is typically done in the time domain to minimize self-interference from both of these links in the RN. For example, some subframes are dedicated to backhaul transmission and the remaining subframes are used to service the RN cell UE. One example is shown in FIG. 3.

In addition, in donor cells with multiple RNs, the donor eNB needs to coordinate the backhaul resource allocation between the RNs as well as serving the donor cell UE. In the special case where all UEs in the donor cell are associated with the RN, the donor eNB may be able to allocate all subframes that can be used for the MBSFN for backhaul communication to the RNs. Effective backhaul resource allocation must be able to balance the transmission over the backhaul link, the access link in the donor cell, and the access link in the RN cells so that higher spectral efficiency and user throughput can be achieved for the network.

When the donor eNB determines backhaul radio resource allocation, some information about the RN cell (e.g., the number of RNs in the donor cell, the number of UEs in the RN cell, etc.) is required for the donor eNB to effectively allocate resources for the RN. Must be available at the eNB. Depending on how quickly the RN cell sends updated information to the donor eNB, the backhaul resource allocation may be static, quasi-static or dynamic. However, it is important to reduce the feedback from the RN to the donor eNB and thus reduce the signaling overhead via backhaul. In the next section, several solutions are proposed in terms of trade-offs between performance and feedback overhead.

 For uplink transmission, the RN cell UE initiates transmission to the RN over the access link. The RN may report the total uplink traffic buffer size from all RN cell UEs to the donor eNB using the buffer status report message (which is implemented in the LTE Rel-8 system). Note that the actual amount of resources allocated for uplink backhaul also depends on the spectral efficiency at that link as well as the QoS of the corresponding traffic. The DeNB will treat the RN as a UE and allocate an uplink backhaul resource according to the buffer status report message, uplink backhaul spectral efficiency and QoS requirements from the RN accordingly. As such, no special processing will be required for DeNB to allocate uplink resources between RNs in this case, and of course it is an on-demand procedure. In addition, in LTE Rel-10, the uplink backhaul resource is automatically allocated according to the downlink backhaul resource. For example, in the FDD system, for every configured downlink backhaul subframe, a corresponding uplink backhaul subframe is configured after 4 milliseconds. Therefore, this document concentrates mainly on downlink backhaul resource allocation for type I relay networks due to the more complex nature of the problem.

The MBSFN subframe may be adopted at the RN to receive downlink backhaul transmission from the DeNB. During these MBSFN subframes, the RN does not transmit to the RN cell UE. MBSFN subframe configuration is determined by the DeNB. Proper MBSFN configuration facilitates balancing traffic flow on both links (access link and backhaul link). Otherwise, a traffic buffer overflow or empty buffer may occur at the RN (eg, if there is not enough resources left for access link transmission, a buffer overflow may occur at the RN, or there may not be enough traffic to be sent to the UE). If not in RN, the buffer is empty). This will result in an inefficient use of radio resources and thus compromise system capacity.

The present disclosure relates, for example, to a downlink backhaul resource allocation scheme for a Type I relay network taking into account both performance and feasibility. The quasi-static allocation solution can achieve a system throughput gain compared to the static resource allocation scheme, even if the feedback from the RN is limited. The present disclosure also contemplates in-band backhaul resource allocation over the backhaul link. In the present disclosure, a relay node can act like a small base station that will make its independent scheduling decision, and no feedback is required for relay cell scheduling. Possible feedback can be used to achieve traffic load balancing between the relay link and the access link. In some implementations, such as LTE-A, over the backhaul link, new channels, such as R-PDCCH and R-PDSCH, are designed to carry backhaul traffic more efficiently.

As mentioned above, the present disclosure relates to backhaul resource allocation. In certain implementations, a static backhaul subframe allocation scheme with minimal feedback from RN to DeNB can be used. In other implementations, a dynamic backhaul resource allocation scheme can be used when the RN reports the data rate transmitted over the RN cell access link. Quasi-static resource allocation schemes based on UE geometry are also discussed, which achieve similar performance with dynamic allocation schemes with significantly reduced overhead.

In static backhaul subframe allocation, in order to allocate different amounts of resources to different RNs, it may be assumed that the DeNB knows the number of users associated with each RN. One of the advantages of static subframe allocation is that the DeNB can operate without knowing the bandwidth requirements of the RN cell user. Subframes allocated for backhaul communication may be synchronous between multiple RNs in the donor cell, meaning that each RN in the donor cell is composed of the same backhaul subframes. In LTE Rel-10, synchronous subframe allocation will mean the same MBSFN configuration for RNs, and all RNs listen for DeNB for DL transmission in the same subframes.

4A is a process flow diagram 400 for static allocation of backhaul resources. The capacity required at the backhaul link may be estimated at the DeNB (402). In certain implementations, the capacity at the backhaul link can be estimated based at least in part on the average signal to interference plus noise ratio (SINR) between the donor eNB and the RN. The average SINR between DeNB and RN i may be represented by S _i . Applying the Shannon theorem, the estimated capacity in the backhaul link in terms of bits per second (bits per second / Hz) per Hz can be derived as follows:

가 또한 이용가능한 MCS 옵션들에 기초하여 경험적으로 획득될 수 있다. 수학식 1에서, 로그 함수는 밑이 2인 것이다. 일반적으로,

는

과 같이 SINR인 S_i의 함수로서 표현될 수 있고, 여기서 f(...)는 수신기 구현에 의해 결정되는 임의의 함수를 나타낸다. 상기 식에서, f(x)는 log₂(1 + x)로서 표현된다.Where N is the number of RNs in the donor cell. For certain cellular systems,

Can also be obtained empirically based on the available MCS options. In Equation 1, the logarithm function is base 2. Generally,

The

Can be expressed as a function of S _i , which is SINR, where f (...) represents any function determined by the receiver implementation. In the above formula, f (x) is expressed as log ₂ (1 + x).

가 Hz당 초당 액세스 링크에서의 추정된 용량을 결정하는 데 사용될 수 있고:The required capacity of the RN access link can be identified (404). Since the DeNB may not know the access link quality in the RN cell, the median SINR of the access link geometry distribution in the RN cell i

Can be used to determine the estimated capacity on the access link per second per Hz:

는 기준 신호와 비교하여 있을 수 있는 데이터의 전력 오프셋으로 인한 RN 셀에서 적용되는 있을 수 있는 상이한 전력 조절을 고려하고 있다(

는 보통 기준 신호로부터 획득됨). 예를 들어, 셀 경계 사용자는 그의 할당된 주파수 대역에서 RN으로부터의 보다 높은 전송 전력으로부터 이득을 볼 수 있는 반면, 셀 중앙 사용자는 RN이 그의 할당된 주파수 대역에서 비교적 더 낮은 전력으로 전송하고 있는 상태에서 여전히 양호한 신호 수신을 가질 수 있다. 값

는, 메디안 SINR 대신에, UE들에 걸친 평균 SINR(mean SINR)로 선택될 수 있다.here

Considers possible different power adjustments applied in the RN cell due to possible power offsets of the data compared to the reference signal (

Is usually obtained from the reference signal). For example, a cell boundary user may benefit from higher transmit power from an RN in its assigned frequency band, while a cell central user may be transmitting at a relatively lower power in its assigned frequency band. Can still have good signal reception. value

May be selected as the mean SINR across UEs, instead of the median SINR.

는 이전의 시뮬레이션 결과에 따라 15dB로 설정될 수 있다. 각각의 백홀 서브프레임에서, 각각의 RN에 할당된 대역폭이 그 RN 셀에서의 UE의 수(또는 그의 다른 함수)에 비례하도록 백홀 대역폭이 할당될 수 있고:M _i is represented by the number of UEs in RN i. As an example,

Can be set to 15dB according to the previous simulation result. In each backhaul subframe, the backhaul bandwidth may be allocated such that the bandwidth allocated to each RN is proportional to the number of UEs (or other functions thereof) in that RN cell:

는 RN들 간의 상이한 백홀 링크 품질을 반영하는 가중 인자이다. 예를 들어,

는 백홀 링크 전송 속도(backhaul link transmission rate)에 반비례(즉,

)하도록 설정될 수 있다. 백홀 링크 전송 속도가 보다 높은 경우, 보다 작은 백홀 대역폭이 할당될 필요가 있다. 백홀 링크 품질이 DeNB와 통신하고 있는 RN들 간에 거의 동일한 경우,

가 1로 설정될 수 있다.Where B is the bandwidth allocated for backhaul in the DeNB,

Is a weighting factor that reflects different backhaul link quality between RNs. E.g,

Is inversely proportional to the backhaul link transmission rate (i.e.,

Can be set). If the backhaul link transmission rate is higher, then a smaller backhaul bandwidth needs to be allocated. If the backhaul link quality is nearly the same between the RNs communicating with the DeNB,

May be set to one.

The number of backhaul subframes may be identified (406). If no UE exists in the RN cell, no backhaul resource will be allocated to that RN. The reason for allocating more resources to RN cells with more users is to facilitate fairness among users and to improve cell boundary performance. The total amount of data in the backhaul per subframe is as follows (in bits per subframe):

는 서브프레임당 지속 시간(time duration)(예컨대, LTE에서 1ms)을 나타낸다. 백홀 링크에서의 총 데이터 레이트가 모든 RN들에 걸친 액세스 링크에서의 총 데이터 레이트와 같도록, 백홀에 할당된 서브프레임의 수(총 가용 서브프레임 T_bh 중 n)가 도출되고:here

Denotes a time duration per subframe (eg 1 ms in LTE). The number of subframes allocated to the backhaul (n of the total available subframes T _bh ) is derived such that the total data rate at the backhaul link is equal to the total data rate at the access link across all RNs:

는 제i RN 셀에서의 가용 액세스 대역폭을 나타내고, T_bh는 백홀 서브프레임 할당의 주기성(서브프레임의 단위로 되어 있음)이다. 이와 같이, 백홀 서브프레임의 수가 다음과 같이 도출될 수 있다:here

Denotes the available access bandwidth in the i th RN cell, and T _bh is the periodicity (in units of subframes) of the backhaul subframe allocation. As such, the number of backhaul subframes may be derived as follows:

가 DeNB에서의 대역폭과 동일한(RN에 대해 완전한 주파수 재사용) 것으로(즉,

인 것으로) 가정한다. 게다가, RN들에서의 액세스 링크 품질에 관한 정보가 DeNB에서 이용가능하지 않은 경우,

및

가 모든 RN에 대해 동일하고, 모든 i에 대해

이고

인 것으로 가정된다. 이들 가정에서, 상기 식은 다음과 같이 단순화될 수 있고:

Is equal to the bandwidth at DeNB (complete frequency reuse for RN) (i.e.

Is assumed to be In addition, if information regarding access link quality in the RNs is not available in the DeNB,

And

Is the same for all RNs, and for all i

ego

It is assumed to be. In these assumptions, the equation can be simplified as follows:

는 x보다 크거나 같은 가장 작은 정수를 나타낸다.here

Denotes the smallest integer greater than or equal to x.

After the number of backhaul subframes is determined, a backhaul resource for each RN may be allocated 408 according to equation (3).

In the above derivation, UEs directly associated with the donor eNB are not considered. This may not be a problem if the backhaul link quality is better than the access link and does not take all the donor cell resources for backhaul transmission. In some cases, the donor eNB may reserve a certain amount of resources to ensure that UEs connected to the LTE network via the donor eNB have sufficient resources. The maximum number of available backhaul subframes is denoted by n _max . If the number n of backhaul subframes calculated from Equation 7 is smaller than n _max , no additional processing is required. Otherwise, if the number n of backhaul subframes is greater than n _max , n is changed to n _max instead. To determine the value of n _max , a simple solution is to make it proportional to the number of UEs in each RN cell:

는 상이한 사용자 우선순위를 고려하기 위해 적용되는 가중 인자이다.Where M ₀ represents the number of UEs associated with the donor eNB,

Is a weighting factor applied to account for different user priorities.

In summary, static sync subframe allocation uses information about the number of RN cells and the number of UEs connected to each RN cell. In some relay architectures, the DeNB may already know this information. In another relay architecture where the number of RN cell users is not available at the DeNB, the RN may report this information to the DeNB by higher layer signaling. In a static subframe allocation scheme, statistics of large user SINR distributions of donor cells and RN cells may be used as a priori knowledge. If this prior knowledge is not available, the RN may signal the average or median SINR of the RN cell user to the donor eNB.

As another alternative, in the static subframe allocation scheme, without knowing the number of UEs in the RN, the donor eNB determines the backhaul resource for the RN based on the average SINR of the UEs in the RN cell and the average SINR between DeNB and RN. You can decide. For example, the number of backhaul subframes for RN i may be determined as follows:

가 선험적 지식인 경우, RN은 어떤 정보도 DeNB로 송신할 필요가 없을 수 있다. 그렇지 않은 경우, RN은 RN 셀에 있는 UE들의 평균 또는 메디안 SINR을 DeNB로 신호할 수 있을 것이다. 백홀 전송을 위해 사용될 수 있는 서브프레임의 최대 수가 n_max이고

인 경우, 부가의 처리가 필요하지 않다. 그렇지 않고,

인 경우, RN i에 대한 할당된 백홀 서브프레임의 수가 다음과 같이 계산될 수 있다:In this case, the average SINR of the UEs in the RN

Is a priori knowledge, the RN may not need to transmit any information to the DeNB. Otherwise, the RN may signal the average or median SINR of the UEs in the RN cell to the DeNB. The maximum number of subframes that can be used for backhaul transmission is n _max

If, no additional processing is necessary. other,

If, the number of allocated backhaul subframes for RN i may be calculated as follows:

및/또는

를 계산할 수 있다(452). 측정 보고가 DeNB로 송신될 수 있다(454). 측정 보고는

또는

의 측정치 및/또는 M_i를 포함할 수 있다. DeNB는 백홀에 대한 요구된 서브프레임의 수를 계산하고 MBSFN 서브프레임을 구성할 수 있다(456). SIB-2가 RN_i로 전송될 수 있다(458). SIB-2 메시지는 구성된 MBSFN 패턴을 포함할 수 있다.4B is a swim lane diagram 450 for static allocation of backhaul resources. Relay node RN _i (which represents one of i relay nodes) may obtain an SINR report from one or more UEs,

And / or

May be calculated (452). The measurement report may be sent to the DeNB (454). Measurement report

or

And / or M _i . The DeNB may calculate the number of required subframes for the backhaul and configure the MBSFN subframe (456). SIB-2 may be sent to RN _i (458). The SIB-2 message may include the configured MBSFN pattern.

The DeNB can dynamically allocate backhaul resources. In order for the DeNB to allocate backhaul resources dynamically, the donor eNB will need to track the data rate transmitted instantaneously over each access link and predict the data rate over the access link at a future time instance. . The DeNB may then dynamically change the resource allocation for the backhaul according to the requirements for the access link data rate. In the dynamic resource allocation scheme, as shown in FIG. 5, resources between the access link and the backhaul link may be separated in the frequency domain. FIG. 5 is a schematic block diagram 500 of an example resource allocation for an access link and a backhaul link. In FIG. 5, the dashed box represents a null resource block without transmission. The RN may operate in a full duplex mode in which the backhaul link and the access link are separated in the frequency domain.

6A is a process flow diagram 600 for dynamic allocation of backhaul resources. The expected access link data rate for each RN cell user may be identified 602. The RN may feed back the expected access link data rate for the next subframe transmission for each user (or UE) in the cell. To reduce the amount of RN feedback, if the access link radio quality is slowly changing, the RN can instead report the expected access link data rate for multiple subframes.

The amount of backhaul resources needed for each RN cell user may be identified by the DeNB (604). In some cases, for all RNs the amount of traffic over the backhaul may be equal to the amount of traffic over the access link if the traffic buffer at the DeNB is not empty. In each subframe, the amount of backhaul resources (in units of PRBs) required for the user in RN cell i with user index j is as follows:

는 백홀 전송 이전에 그 다음 서브프레임에서 액세스 링크에서의 예측된 전송 블록 크기를 나타내고, Q_ij는 RN 셀 i에 있는 사용자-j에 대한 DeNB에서의 현재의 트래픽 버퍼 크기를 나타내며, B_prb는 PRB당 대역폭(예컨대, LTE/LTE-A에서 180kHz)을 나타낸다. 가용 백홀 자원의 총량이 식별될 수 있다(606). 가용 백홀 자원의 양이 사전 결정되어 있거나 다른 인자들에 기초할 수 있는 값으로 제한될 수 있다. 예를 들어, 가용 백홀 자원의 총량이 RN 셀에 및 도너 eNB 셀에 있는 사용자의 수에 기초하여 정의될 수 있는

PRB로 제한될 수 있고:here

Denotes the estimated transport block size on the access link in the next subframe before backhaul transmission, Q _ij denotes the current traffic buffer size at DeNB for user-j in RN cell i, and B _prb is the PRB Bandwidth per second (eg, 180 kHz in LTE / LTE-A). The total amount of available backhaul resources may be identified (606). The amount of available backhaul resource may be limited to a value that may be predetermined or based on other factors. For example, the total amount of available backhaul resources can be defined in the RN cell and based on the number of users in the donor eNB cell.

It can be limited to PRBs:

는 상이한 사용자 우선순위를 고려하기 위해 적용되는 가중 인자이다. 보다 높은 QoS 요구사항을 갖는 사용자에 대해서는,

의 보다 높은 값이 할당될 수 있다. 모든 사용자들이 동일한 우선순위를 가지는 특수한 경우에,

는 1로 설정될 수 있다.Where M ₀ represents the number of UEs associated with the donor eNB, N ₀ represents the total number of PRBs available at the donor eNB,

Is a weighting factor applied to account for different user priorities. For users with higher QoS requirements,

Higher values of may be assigned. In the special case where all users have the same priority,

May be set to one.

가 가용 자원의 양을 초과하기 때문에 할당될 충분한 자원이 없을 수 있다. 백홀 자원의 양이 불충분한 경우, 각각의 RN 셀 사용자에 할당되는 PRB의 수가, 예를 들어, 다음과 같이 스케일링될 것이다(610):Allocation may be based on available backhaul resources (607). If the backhaul link quality is low, the total amount of resources needed for all RN cell users from equation (9).

There may not be enough resources to be allocated because the amount of available resources exceeds. If the amount of backhaul resources is insufficient, the number of PRBs allocated to each RN cell user will be scaled, for example, as follows (610):

및

으로서 도출될 수 있다.If there are enough backhaul link resources, a backhaul resource for each RN may be allocated (608). The backhaul resources allocated to the RN cells (in units of PRBs) are for the case where the amount of backhaul resources is sufficient and for the case where the amount of backhaul resources is insufficient, respectively.

And

Can be derived as

이다. 동적 백홀 자원 할당은 액세스 링크 데이터 레이트의 정보를 이용하고, 백홀 링크를 통해 DeNB로부터 RN으로 동일한 양의 데이터가 전송되도록 자원을 할당한다.The information that needs to be fed back from the RN to the DeNB is the estimated transport block size in the access link for all RN cell UEs in each subframe.

to be. Dynamic backhaul resource allocation utilizes information of the access link data rate and allocates resources such that the same amount of data is transmitted from DeNB to RN over the backhaul link.

및/또는

를 계산할 수 있다(652). 측정 보고가 DeNB로 송신될 수 있다(654). 측정 보고는 RNi로부터 송신될 수 있고, j(값 j는 UE 인덱스임)의 모든 값들에 대한

및

의 측정치를 포함할 수 있다. DeNB는 각각의 UEj에 대한 백홀에 대해 요구되는 자원 블록(RB)의 수를 계산할 수 있다(656). DeNB는 백홀(PDCCH)에 대한 하향링크(DL) 자원을 할당할 수 있다(658).6B is a swim lane diagram 650 for dynamic resource allocation for a backhaul link. The relay node RN _i estimates Q _ij

And / or

It can be calculated (652). The measurement report may be sent to the DeNB (654). The measurement report can be sent from RNi and for all values of j (value j is the UE index).

And

It may include a measure of. The DeNB may calculate 656 the number of resource blocks (RBs) required for the backhaul for each UEj. The DeNB may allocate downlink (DL) resources for the backhaul (PDCCH) (658).

In the static backhaul resource allocation scheme, the signaling overhead is negligible, but the performance gain obtained by the RN may not be satisfactory in certain cases. In dynamic backhaul resource allocation, performance can be greatly improved, but signaling overhead can be increased. Quasi-static backhaul resource allocation may be considered. In semi-static resource allocation, the RN may operate in half-duplex mode. When multiple RNs are present in a donor cell, each RN may have a different backhaul subframe allocation and may not share a backhaul subframe with other RNs (shown in FIG. 7).

7 is a block diagram of an exemplary asynchronous multicast broadcast single frequency network (MBSFN) resource allocation 700 for multiple relay nodes. The eNB may allocate one full subframe to one RN and another full subframe to another RN. The advantage of this asynchronous RN operation is that the RN can limit the number of subframes on which it listens to DeNB and more subframes can be used for access link transmission.

As illustrated in FIG. 8, it is also possible to multiplex one set of RNs in one subframe and multiplex another set of RNs in another subframe. 8 is a block diagram of an exemplary asynchronous multicast broadcast single frequency network (MBSFN) resource allocation 800 for multiple relay nodes sharing the same subframe. For example, in subframe 2 802, RN1 and RN2 shares the same subframe. If the RNs are located close to each other, the asynchronous RN operation in FIG. 7 may cause relay-to-relay interference. For example, in FIG. 7, during subframe two 702, RN1 may be listening to the DeNB at the DL frequency, while RN2 may be transmitting to its UE at the same frequency. As a result, when RN1 and RN2 are close to each other, RN1 can see the interference from RN2. In this case, the RN operation in FIG. 8 may be used such that nearby RNs are multiplexed into the same backhaul subframe and distant RNs are assigned different backhaul subframes. In some cases, RNs may be grouped together and then share a common resource to avoid interference. This concept of "relay group" could be widely used. For example, when multiple repeaters are placed in the same building to improve throughput, these repeaters may form a "repeater group" and may have a group ID. These relays can share common downlink backhaul resources or even perform DL / UL multi-point cooperative transmission.

로 나타내어질 수 있다. 각각의 RN 셀 UE의 액세스 링크에 대한 평균 용량이 식별될 수 있다(904). 샤논 정리를 적용하면, RN 셀 i와 사용자 j 사이의 액세스 링크에 대한 평균 용량(초당 Hz당 비트의 단위로 되어 있음)은 다음과 같고: 9A is a process flow diagram 900 for quasi-static backhaul resource allocation. Quasi-static subframe allocation can be based, for example, on the average SINR for the access link, which can facilitate the tradeoff between signaling overhead and performance gain. The geometry or average SINR of each RN cell UE may initially be reported to the DeNB, and may be updated quasi-statically, for example, in accordance with UE mobility and radio link change (902). The SINR distribution can be estimated by CQI feedback from the UE at the RN or can be derived from the UE measurement report. The average SINR for a user in RN cell i with user index j is

Lt; / RTI > The average capacity for the access link of each RN cell UE may be identified 904. Applying the Shannon theorem, the average capacity (in bits per second per second) for the access link between RN cell i and user j is:

는 기준 신호와 비교하여 사용자 j에 대한 있을 수 있는 데이터의 전력 오프셋으로 인한 RN 셀에서 적용되는 있을 수 있는 상이한 전력 조절을 고려하고 있다. 백홀 링크에 대한 평균 용량(초당 Hz당 비트의 단위로 되어 있음)이, 예를 들어, 수학식 1에 의해 계산될 수 있다(906). RN 셀 i에 대한 백홀 서브프레임의 수가 식별될 수 있다(908). 예를 들어, 액세스 링크를 통하는 것과 거의 동일한 양의 트래픽이 백홀 링크를 통해 전달되도록, 백홀 서브프레임의 수가 총 액세스 링크 데이터 레이트에 기초하여 결정될 수 있고, 이는 다음과 같이 주어지고:here

Considers possible different power adjustments applied in the RN cell due to the power offset of the possible data for user j compared to the reference signal. The average capacity (in units of bits per Hz per second) for the backhaul link may be calculated, for example, by Equation 1 (906). The number of backhaul subframes for RN cell i may be identified (908). For example, the number of backhaul subframes can be determined based on the total access link data rate so that approximately the same amount of traffic as on the access link is carried over the backhaul link, which is given by:

Where Q _ij is the average buffer size for user j that can be reported by RN cell i, or can be derived from the user traffic profile, and T _bh is the periodicity (in units of subframes) of the backhaul subframe allocation. . For example, in LTE-A Rel-10, T _bh may be set as 10 or 40 subframes. N _i in the above formula can be obtained as follows:

In the case of a full buffer traffic model for the UE and if the RN has the same bandwidth as the donor eNB (full frequency reuse), equation (14) can be simplified to equation (15):

The backhaul resource allocated to the RN cell UE in the backhaul subframe is proportional to the UE access link rate, which is given by:

In other cases, the UE does not need to be allocated backhaul bandwidth within each backhaul subframe. The overall n _i backhaul subframe bandwidth is distributed to the UEs based on the access rate of the UEs. As such, the backhaul resource allocated to the RN cell UE in the n _i backhaul subframe is proportional to the UE access link rate, which is given by:

인 경우, 부가의 처리가 필요하지 않다. 그렇지 않고

인 경우, 할당된 백홀 서브프레임의 수가 다음과 같이 계산될 수 있다:Similar to that described above for dynamic allocation, any number of subframes may be reserved for a UE that is directly associated with the donor cell, or may be constrained from not making backhaul transmissions (eg, subframe 0). , 4, 5, 9 cannot be used for backhaul subframe in Rel 10). Nmax represents the maximum number of subframes that can be used for backhaul transmission.

If, no additional processing is necessary. other

If, the number of allocated backhaul subframes can be calculated as follows:

로 수학식 16 또는 수학식 17을 사용하여 결정될 수 있다. 수학식 18에서, 할당된 백홀 서브프레임의 수

는 도 7에 예시되어 있는 바와 같이, 특정의 RN i로의 백홀 전송을 위해 전용되어 있을 수 있다.The backhaul resource allocated to each RN cell UE is the number of modified backhaul subframes.

It can be determined using Equation 16 or Eq. In Equation 18, the number of allocated backhaul subframes

7 may be dedicated for backhaul transmission to a particular RN i, as illustrated in FIG. 7.

또는 수학식 15에서의

)를 DeNB로 신호할 수 있을 것이다.Thus, the number of backhaul subframes and the resources for each RN cell UEN in the backhaul subframe are determined. In quasi-static backhaul subframe allocation, the geometry or average SINR of each RN cell UE is fed back from the RN to the DeNB. No additional complexity will be added to the UE because the RN may be able to estimate the UE geometry or average SINR from the CQI or measurement report. Unlike the static allocation described above, the DeNB can allocate resources according to the data rate in the access link of each RN cell UE, so more efficient resource utilization can be achieved. On the other hand, user geometry or average SINR will change to a slow scale, so only a limited amount of feedback overhead will be needed. As another alternative, instead of the RN signaling the average SINR of each RN cell UE to the DeNB, in order to further reduce the feedback, the RN is calculated using the total access link data rate (e.g.,

Or in equation (15)

) May be signaled to DeNB.

를 계산할 수 있고

를 계산할 수 있다(952). 측정 보고가 중계 노드(RN_i)로 송신될 수 있다(954). 측정 보고는

또는

의 측정치를 포함할 수 있다. 중계 노드(RN_i)는 측정 보고를 DeNB로 송신할 수 있다(956). DeNB로 송신되는 측정 보고는 j의 모든 값에 대한

또는

및/또는

의 측정치를 포함할 수 있다. DeNB는 백홀에 대한 요구된 서브프레임의 수를 계산하고 MBSFN 서브프레임을 구성할 수 있다(958). MBSFN 서브프레임 구성을 나타내는 그룹 RNTI-기반 RRC 메시지가 DeNB로 송신될 수 있다(960). 어떤 경우에, 이 메시지는 또한 멀티캐스트일 수 있다.9B is a swim lane diagram 950 for quasi-static backhaul resource allocation. UE (or multiple UEs, denoted by index j: UE _j ) is SINR

Can be calculated

Can be calculated (952). The measurement report may be sent to the relay node RN _i (954). Measurement report

or

It may include a measure of. The relay node RN _i may transmit a measurement report to the DeNB (956). Measurement reports sent to the DeNB for all values of j

or

And / or

It may include a measure of. The DeNB may calculate the number of required subframes for the backhaul and configure the MBSFN subframe (958). A group RNTI-based RRC message indicating the MBSFN subframe configuration may be sent to the DeNB (960). In some cases, this message may also be multicast.

This disclosure describes backhaul resource allocation in a type I relay network, and describes static, dynamic, and quasi-static resource allocation schemes. Depending on the overhead constraints, any scheme may be chosen to accommodate Type I relay network design requirements. However, quasi-static resource allocation solutions can provide the desired tradeoff between performance and signaling overhead. In summary, when RN is added to the macro network, the user throughput can be significantly increased by the high backhaul resource allocation scheme.

Although this specification contains many details, these details should be construed as a description of features that may relate to particular implementations, rather than a limitation to the claims. Certain features that are described in this specification in the context of separate implementations can also be implemented in combination in a single implementation. Alternatively, the various features described in connection with a single implementation can also be implemented individually or in any suitable subcombination in multiple implementations. Moreover, although the features have been described above as operating in a particular combination and may even be initially claimed as such, one or more features from the claimed combination may, in some cases, be excluded from the combination and claimed The combination may relate to subcombinations or variations of subcombinations.

Similarly, although the actions are shown in the drawings in a particular order, this is because these actions must be performed in the particular order shown, or in the sequential order, or all illustrated actions must be performed to achieve desirable results. It should not be construed as requiring something to do. In certain situations, multitasking and parallel processing may be advantageous. Moreover, the separation of various system components in the implementations described above should not be construed as requiring such separation in all implementations.

Other implementations are within the scope of the following claims.

Claims (27)

A method of operating a wireless communication system including a relay node (RN) and a base station,
At the base station, identifying a backhaul link data rate for a first wireless link between the relay node and the base station;
Identifying an access link data rate for a second wireless link between the relay node and user equipment (UE); And
Adjusting the allocation of available resources between the backhaul link and the access link
/ RTI >
Method of operation of a wireless communication system. The method of claim 1,
Wherein a backhaul data rate between the base station and a particular relay node is identified based at least in part on an average signal to interference plus noise ratio (SINR) measured over a particular link,
Method of operation of a wireless communication system. The method of claim 1,
Wherein the access link data rate is identified based at least in part on an average signal to interference plus noise ratio (SINR) observed over the access link.
Method of operation of a wireless communication system. The method of claim 3,
The average SINR observed over the access link is scaled by power control parameter,
Method of operation of a wireless communication system. The method of claim 1,
Wherein the access link data rate is identified based at least in part on an average signal to interference plus noise ratio (SINR) observed over an access link between the relay node and associated user equipment;
Method of operation of a wireless communication system. 6. The method of claim 5,
The average SINR observed over the access link between the relay node and the UE is scaled by a power control parameter,
Method of operation of a wireless communication system. The method of claim 1,
The allocation of resources between the backhaul link and the access link comprises (T _bh -n) over N independent access links and aggregate data transmitted in n subframes over the backhaul link. Is optimized by allocating n subframes every T _bh subframes such that the total data transmitted in the subframes is the same,
Method of operation of a wireless communication system. The method of claim 1,
The allocation of resources between the backhaul link and the access link is such that the expected future transport block for UE-j can be transmitted using n _ij resource blocks, so that the backhaul link between the base station and RN-i Is optimized by allocating n _ij resource blocks to convey data for UE-j through
Method of operation of a wireless communication system. 9. The method of claim 8,
The expected future transport block size is one of the transport block size expected to be transmitted by RN-i and the size of the data buffer for UE-j (UE-j is attached to RN-i). Is the minimum value,
Method of operation of a wireless communication system. The method of claim 1,
Allocation of resources between the backhaul link and the access link is performed via an access link associated with RN-i and total data transmitted in n _i subframes over the backhaul link (T _bh -n _i ). Optimized by assigning n _i subframes to the backhaul link between the base station and RN-i so that the total data transmitted in the subframes is the same, every T _bh subframes
Method of operation of a wireless communication system. The method of claim 1,
Optimizing the data rate over the backhaul link and the access link data rate associated with the relay node is based on at least in part on the number of UEs connected to the relay node, between the backhaul data rate and the access link data rate. That includes maintaining balance,
Method of operation of a wireless communication system. A network element operating in a wireless communication network,
Hardware processor; And
Transceiver
Lt; / RTI >
The hardware processor and the transceiver,
Identify a backhaul link data rate for the first wireless link between the relay node and the base station;
Identify an access link data rate for a second wireless link between the relay node and a user equipment (UE);
Is configured to regulate the allocation of available resources between the backhaul link and the access link,
Network element. The method of claim 12,
Wherein a backhaul data rate between the base station and a particular relay node is identified based at least in part on an average signal to interference plus noise ratio (SINR) measured over a particular link,
Network element. The method of claim 12,
Wherein the access link data rate is identified based at least in part on an average signal to interference plus noise ratio (SINR) observed over the access link.
Network element. 15. The method of claim 14,
The average SINR observed over the access link is scaled by power control parameter,
Network element. The method of claim 12,
Wherein the access link data rate is identified based at least in part on an average signal to interference plus noise ratio (SINR) observed over an access link between the relay node and associated user equipment;
Network element. 17. The method of claim 16,
The average SINR observed over the access link between the relay node and the UE is scaled by a power control parameter,
Network element. The method of claim 12,
Allocation of resources between the backhaul link and the access link is performed in (T _bh -n) subframes over N independent access links and total data transmitted in n subframes over the backhaul link. Is optimized by allocating n subframes every T _bh subframes such that the total data transmitted is equal,
Network element. The method of claim 12,
The allocation of resources between the backhaul link and the access link is such that the expected future transport block for UE-j can be transmitted using n _ij resource blocks, so that the backhaul link between the base station and RN-i Is optimized by allocating n _ij resource blocks to convey data for UE-j through
Network element. 20. The method of claim 19, wherein the expected size of the future transport block is determined by the transport block size and UE-j (UE-j attached to RN-i) expected to be transmitted by RN-i. Is the minimum of the size of the data buffer for
Network element. The method of claim 12,
Allocation of resources between the backhaul link and the access link is performed via an access link associated with RN-i and total data transmitted in n _i subframes over the backhaul link (T _bh -n _i ). Optimized by assigning n _i subframes to the backhaul link between the base station and RN-i so that the total data transmitted in the subframes is the same, every T _bh subframes
Network element. The method of claim 12,
Optimizing the backhaul data rate and the access link data rate comprises maintaining a balance between the backhaul data rate and the access link data rate based at least in part on the number of UEs connected to the relay node sign,
Network element. The method of claim 12,
Further comprising receiving information about the UE from the relay node,
Network element. The method of claim 12,
Further comprising predicting a request for resources for the UE,
Network element. The method of claim 12,
Further comprising identifying a signal to interference and noise ratio between the relay node and the base station, wherein identifying the backhaul data rate is based at least in part on the signal to interference and noise ratio;
Network element. The method of claim 12,
Wherein the backhaul data rate is identified based at least in part on an average signal to interference plus noise ratio (SINR) of all UEs connected to the relay node,
Network element. The method of claim 12,
The backhaul data rate is identified based at least in part on a total access link data rate of the relay node;
Network element.

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